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6 To give you an idea of how rocker arms have evolved, check out this comparison shot. Our take-off rocker was not only showing signs of wear, but it has a very small pivot shaft compared to the new Comp piece. You can also see that the material has been moved around in the design to increase strength where it’s needed. We are not here to say our old rockers were a bad design, as they lasted almost 25 years on a solid-lifter, nitrous motor, but with the improvements of our new rockers and the larger stud size, the new ones should last even longer. The inset shows the roller tip cutting into the side of the body on our old rockers, revealing why we are even going down this road.